Exhaust gas recirculation system for automobile engine

Abstract

The invention relates to an EGR (Exhaust Gas Recirculation) system of an automobile engine, which is used for solving problems that pipeline structures of EGR systems of conventional engines are complicated and exhaust quantities are difficult to accurately control. The EGR system comprises an engine cylinder, an auxiliary cylinder, an auxiliary cylinder piston and an electromagnetic control valve, wherein the auxiliary cylinder piston is arranged inside the auxiliary cylinder, a passageway which is used for communicating the auxiliary cylinder and the engine cylinder is arranged between the auxiliary cylinder and the engine cylinder, and the electromagnetic control valve is arranged on the passageway. With the adoption of the EGR system, the EGR air inflow can be accurately controlled, the matching range of the EGR and an engine operating condition is enlarged, and the dynamic property, the economy and the emission performance of the engine are obviously improved.

Description

technical field [0001] The invention relates to an automobile engine, in particular to an exhaust gas recirculation system of the automobile engine, and belongs to the technical field of combustion engines. Background technique [0002] Engine exhaust gas recirculation technology (EGR) is to introduce a certain amount of exhaust gas into the cylinder combustion chamber and mix it with air to participate in combustion again. Since the exhaust gas contains H2O vapor, N2 and CO2, etc., the heat capacity of the mixed gas entering the combustion chamber is increased, thereby reducing the maximum combustion temperature, destroying the high-temperature generation conditions of NOx, reducing the concentration of NOx in the exhaust gas, and improving Engine emission performance. [0003] Existing EGR systems can be roughly divided into two categories, namely EGR systems outside the cylinder and EGR systems inside the cylinder. Among them, the EGR system outside the cylinder general...

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Problems solved by technology

Although the solution of this patent can control the supply of recirculated exhaust gas according to the driving conditions of the vehicle, so that the fuel combustion conditions are improved to a certain extent, and at the same time overcome the drawbacks of the complex structure of the EGR system outside the cylinder block, the exhaust gas recirculation system of the vehicle The recirculated exhaust gas is introduced from the intake manifold passage, which does not solve the problem that the exhaust gas collection of the EGR system is affected by factors such as exhaust back pressure and boost pressure.

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